We found a foam box we weren't using anymore (I think it was a cd holder at one time). This would serve as the main drive through part of the car wash. I cut holes in the frame big enough for monster trucks to drive though (and therefore Hotwheels cars would fit as well).
I planned where ribbons and felt pieces would hang down and attached them with wooden skewers.
I found that hair rollers made the perfect car wash accessory, so to keep them rolling, I put a plastic peg through the floor for it to sit on. I had to cut into the side a bit for the rollers to be wide enough and still work.
We had a front to a toy hospital that was rarely played with. This served as our entrance.
I hot glued everything in place and let Finn play with it. BUT the car wash wasn't done....
I poked holes in some flexible tubing we had and threaded it through the top of the car wash and into a squeeze bottle (Wilton brand). I blocked off the open end with hot glue and some red duct tape.
SQUEEZE! It's time for these trucks to get wet!!